GRAIN BOUNDARY CHARACTER DISTRIBUTIONS OF LEAD ALLOY ANNEALED AT ELEVATED TEMPERATURE AFTER ROLLED AT DIFFERENT TEMPERATURES

Acta Metall Sin

2008, Vol. 44

Issue (6): 652-658 DOI:

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GRAIN BOUNDARY CHARACTER DISTRIBUTIONS OF LEAD ALLOY ANNEALED AT ELEVATED TEMPERATURE AFTER ROLLED AT DIFFERENT TEMPERATURES

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山东理工大学机械工程学院金属材料系

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;. GRAIN BOUNDARY CHARACTER DISTRIBUTIONS OF LEAD ALLOY ANNEALED AT ELEVATED TEMPERATURE AFTER ROLLED AT DIFFERENT TEMPERATURES. Acta Metall Sin, 2008, 44(6): 652-658 .

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Abstract The grain boundary character distributions (GBCD) of Pb-0.09Ca-1.5Sn-0.026Al alloy (mass fraction, %) rolled at different temperatures and then annealed in the same way (270℃/10min) were investigated by means of electron back scatter diffraction (EBSD)techniques. The results showed that special boundaries such as ∑3, ∑9 and ∑27 were largely populated in the specimen which was rolled at room temperature and the temperature of liquid nitrogen(-196℃), the fraction of ∑3 and ∑9＋∑27 boundaries exceeded 60% and 12%, respectively. The connectivity of general high angle boundaries (HABs) networks was interrupted substantially by special boundaries, indicating the optimization of GBCD was achieved. However, much lower fraction of special boundaries were developed in the specimen which were rolled at 100℃, and the connectivity of general high angle boundaries (HABs) network was not interrupted significantly, implying the GBCD was not optimized. Single section trace analysis based on EBSD technique revealed that incoherent 3 boundaries took the major parts of of 3 boundaries in the optimized GBCD

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Received: 10 October 2007

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